STMicroelectronics STEVAL-LLL003V1

Overview

STEVAL-LLL003V1 from STMicroelectronics is an evaluation board for a 7.5 W non-isolated constant-current LED driver based on the VIPer0P offline high-voltage converter IC, implementing buck topology with 130 mA ±2.5% output current across 15–21 white LEDs, 60 kHz fixed switching frequency, and ≅89% peak efficiency at full load.

For engineers reviewing the STEVAL-LLL003V1 datasheet, STEVAL-LLL003V1 pinout, STEVAL-LLL003V1 application, or STEVAL-LLL003V1 equivalent, this board supports rapid validation of VIPer0P-based LED drivers in US (85–135 VAC) and EU (175–285 VAC) mains input configurations with integrated EMI compliance and protection features.

Technical Context

The board implements a non-isolated buck converter using the VIPer0P IC, which integrates an 800 V avalanche-rugged power MOSFET and current-mode controller with embedded floating EAGND for direct LED current sensing. Input voltage selection is hardware-configured via jumper J2 to enable either voltage-doubler (US) or bridge-rectifier (EU) operation.

It delivers regulated 130 mA output with ±2.5% accuracy over temperature and line, achieves Class B conducted EMI compliance per IEC55022 with minimal external filtering due to built-in frequency jittering, and includes open-circuit, short-circuit, and thermal shutdown protections alongside soft-start for inrush control.

Key Specifications

Availability

STEVAL-LLL003V1 is available at Aetrix Electronics and suitable for LED lighting prototyping, smart bulb reference design validation, and industrial indicator driver qualification requiring stable component supply and pre-validated safety-compliant topologies.

Supply support for STEVAL-LLL003V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer applications.

This evaluation board belongs to ST's LED Lighting Solutions product line, developed to accelerate adoption of VIPer0P-based offline LED drivers with integrated protection, EMI optimization, and dual-input-range flexibility for global mains compatibility.

FAQ

What input voltage configurations does STEVAL-LLL003V1 support?

The board supports two distinct AC input ranges: 85–135 VAC (US) when jumper J2 is closed to enable voltage-doubling mode, and 175–285 VAC (EU) when J2 is open to configure a standard bridge rectifier. No additional component changes are required-only jumper repositioning enables region-specific operation.

How is LED current regulated on this board?

Current regulation uses the VIPer0P's embedded floating EAGND (error amplifier ground), allowing direct sensing of LED string current via a low-side sense resistor. This architecture eliminates optocoupler feedback and achieves ±2.5% accuracy across line, load, and temperature without secondary-side compensation.

Does STEVAL-LLL003V1 meet international EMC standards?

Yes-it complies with IEC55022 Class B conducted emissions using only a minimal external EMI filter, enabled by the VIPer0P's internal frequency jittering. It also meets IEC61000-4-2 (±8 kV contact ESD), IEC61000-4-4 (4 kV burst), and IEC61000-4-5 (1 kV surge) immunity requirements.

Can this board drive more than 21 white LEDs?

No-the design targets 15–21 white LEDs (≈60–90 V total forward voltage). Exceeding 21 LEDs raises output voltage beyond the VIPer0P's safe operating area and risks violating the 600 V drain-source rating under transient conditions. Output voltage is not adjustable; it scales with LED count within the specified range.